I have "1 hour"
, "2 hours"
, in a column in Calc, and I would like to extract the numbers only. I've tried VALUE(A9)
, but it doesn't work.
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This is an Excel solution but my understanding is that Calc supports most Excel functions. If your number always appears at the beginning of a text string and is followed by at least one space, then: =VALUE(LEFT(A1,SEARCH(" ",A1)1)) will extract the value from such a string in cell A1. 

